Free boating theory questions and short answers
Search-friendly answers for Day Skipper theory, Marine Radio SRC, VHF procedure, buoyage, lights, tides, CEVNI and practical revision. Each page has one question, a short answer, a mini quiz and a link to revise the full topic.
Radar
Free questions
What does a radar display show?Why can a clean-looking radar display be unsafe?What does a VRM measure?Which factors affect target strength on radar?A relative plot forecasts a CPA of 1.0 M. What does CPA mean here?Why is AIS not a complete traffic picture?What is radar pilotage best used for?What does radar allow in restricted visibility?What is the first step in a radar scenario?Why must a small craft remain in the risk picture when its echo fades in rough water?What does gain primarily affect?What does an EBL measure?What is the safest claim about radar reflectors?What does a plotted TCPA of 30 minutes mean?What should you do with a radar echo that has no AIS label?What is parallel indexing?What is the safest response if CPA is uncertain in fog?How should a crossing contact be assessed?A blank wedge remains on the same relative bearing when the boat changes heading. Which cause should be investigated first?What is the risk of excessive sea clutter suppression?